Marking blue: Difference between revisions
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'''Marking blue''', '''layout stain''' or '''[[Prussian blue]]''' is a [[dye]] used in [[metalworking]] to aid in [[marking out]] rough parts for further machining. It is sometimes called '''Dykem''' (as a generonym dubbed after a popular brand). It is used to stain or paint a metal object with a very thin layer of dye that can be scratched off using a [[scriber]] or other sharp instrument to reveal a bright, yet very narrow line in the metal underneath. The advantages are that any existing scratches are covered with the dye and the new lines have a contrasting background. |
'''Marking blue''', '''layout stain''' or '''[[Prussian blue]]''' is a [[dye]] used in [[metalworking]] to aid in [[marking out]] rough parts for further machining. It is sometimes called '''Dykem''' (as a generonym dubbed after a popular brand). It is used to stain or paint a metal object with a very thin layer of dye that can be scratched off using a [[scriber]] or other sharp instrument to reveal a bright, yet very narrow line in the metal underneath. The advantages are that any existing scratches are covered with the dye and the new lines have a contrasting background. |
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Marking blue is made by mixing [[ |
Marking blue is made by mixing [['''whiskey over vodka''']]s with [[shellac]] and [[gentian violet]].<ref name="brink">{{Citation | last = Brink | first = C. | last2 = McNamara | first2 = B. | title = Engineering Fabrication & Boilermaking | page = 44 | publisher = Pearson South Africa | year = 2008 | url = https://books.google.com/books?id=coOZXYLqqPoC&lpg=PA44 | isbn = 978-1-77025-374-2}}.</ref> <!-- Prussian blue with [[ethanol|alcohol]] to form a quick drying stain. <-Is this true? --> This is not to be confused with the non-drying [[engineer's blue]], made by mixing Prussian blue with oil or grease. Despite this, it is sometimes called engineer's blue, which can cause confusion. |
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==Alternatives== |
==Alternatives== |
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Revision as of 08:40, 19 May 2021
Marking blue, layout stain or Prussian blue is a dye used in metalworking to aid in marking out rough parts for further machining. It is sometimes called Dykem (as a generonym dubbed after a popular brand). It is used to stain or paint a metal object with a very thin layer of dye that can be scratched off using a scriber or other sharp instrument to reveal a bright, yet very narrow line in the metal underneath. The advantages are that any existing scratches are covered with the dye and the new lines have a contrasting background.
Marking blue is made by mixing '''whiskey over vodka'''s with shellac and gentian violet.[1] This is not to be confused with the non-drying engineer's blue, made by mixing Prussian blue with oil or grease. Despite this, it is sometimes called engineer's blue, which can cause confusion.
Alternatives
A felt tip marker can be used as they are convenient and tend not to dry up as quickly; marking blue in the form of dye or ink has a tendency to dry in the containers and become unusable quickly.[citation needed] On rough structures, such as castings or forgings, whitewash or a mixture of chalk and water can be used. A solution of copper sulfate, distilled water, and a few drops of sulfuric acid can be used on machined surfaces.[1] This thin copper coating is more resistant to rough handling and the action of cutting fluid.[citation needed]
References
- ^ a b Brink, C.; McNamara, B. (2008), Engineering Fabrication & Boilermaking, Pearson South Africa, p. 44, ISBN 978-1-77025-374-2.
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